"igarashit" wrote : good idea, but someone may think that the server side exception | should not be shown at client, I think. | It is better that whether the string is transmitted to client or not is configurable. | And, I think it should be logged on the server side, | because of the trouble to solve is on the server side. | | Hmm, do you understand me? sorry to my poor english:) I am inclined to agree. I don't think should be told what's wrong at the server - it's not of their concern. I think the client should only be told information that's going to help them in some way, e.g. if they have misused the API. Being told the database has crashed is not for them to know. This kind of thing should be logged out at the server side, where (for instance) log4j could be configured to shoot out an email to the sysadmin. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961077#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...